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Conferences

Comparing Room Temperature and Cryogenic Cesium Fountains

July 31, 2011

Author(s)

Steven R. Jefferts, Thomas P. Heavner, Thomas E. Parker, Jon H. Shirley, Elizabeth A. Donley, Filippo Levi, Davide Calonico, C Calosso, Giovanni Costanzo, B. Mongino

We have compared the frequency of a room temperature cesium fountain primary frequency standard with that of a cryogenic (~80K) cesium fountain. This comparison...

Towards an all-digital time scale

July 31, 2011

Author(s)

Stefania Romisch, Steven R. Jefferts, Thomas E. Parker

The implementation of an all-digital time scale is under way at NIST, using a novel 8-channel, all-digital phase measurement system based on subsampling...

Examination of Time and Frequency Control Across Wide Area Networks Using IEEE-1588v2 Unicast Transmissions

July 31, 2011

Author(s)

Andrew N. Novick, Marc A. Weiss, Kang B. Lee, Douglas D. Sutton

The IEEE 1588-2008 Precision Time Protocol (PTP) version 2 (IEEE 1588v2) can be used to synchronize a slave clock with a grandmaster clock over a wide area...

Update on a Comparison of Cesium Fountain Primary Frequency Standards

July 31, 2011

Author(s)

Thomas E. Parker

An update to a previous long term frequency comparison of cesium fountain primary frequency standards has been made. This update covers the approximate three...

Coordinating GPS Calibrations Among NIST, NRL, USNO, PTB, and OP

July 31, 2011

Author(s)

Marc A. Weiss, Victor S. Zhang, J White, K Senior, Demetrios Matsakis, S. Mitchell, P Uhrich, D Valat, W Lewandowski, G. Petit, Andreas Bauch, T. Feldman, A. Proia

Reviewing calibration results over the history since early 1980s among several labs shows very mixed results. The best stabilities of receivers, as given by...

Vibration Sensitivity of Optical Components: A Survey

July 31, 2011

Author(s)

Archita Hati, Craig W. Nelson, David A. Howe

We propose and demonstrate a novel technique to measure the vibration sensitivity of two-port fiber-based optical components. It uses a common-arm counter...

Alternative Variables for Computing Sideband Pulling in Atomic Frequency Standards

July 31, 2011

Author(s)

Jon H. Shirley

Sideband pulling has long been considered a possible source of frequency bias in atomic frequency standards. We treat a two-level system excited by coherent...

Transatlantic 2.5 MChip/s Two-Way Satellite Time and Frequency Transfer with Surface Acoustic Wave Filters

July 31, 2011

Author(s)

Victor S. Zhang, Thomas E. Parker, Joseph Achkar, Daniele Rovera

From August 2010 to April 2011, NIST and OP conducted an experiment of using surface acoustic wave (SAW) filters in transatlantic two-way satellite time and...

Residual PM Noise Evaluation of Radio Frequency Mixers

July 31, 2011

Author(s)

Corey A. Barnes, Archita Hati, Craig W. Nelson, David A. Howe

Direct observation of phase modulated (PM) noise is often difficult due to the high dynamic range that exists between the carrier and the modulated sidebands. A...

Limited Live-time Measurements of Frequency Spectra

July 31, 2011

Author(s)

David A. Howe, Neil Ashby, Danielle G. Lirette, Archita Hati, Craig W. Nelson

Frequency-difference-of-arrival (FDOA) can be used to monitor and track an emitters location by observing Doppler frequency shifts of the carrier during short...

Smart Clocks Have a Hand in the Smart Grid

July 29, 2011

Author(s)

Jeffrey Fletcher, Dhananjay Anand, Maruthi Chaluvadi, Julien M. Amelot, Ya-Shian Li-Baboud, James Moyne

Clock synchronization is becoming an increasingly important characteristic of modern wide area monitoring and control systems such as the power grid. It...

Lithography and Chemical Modeling of Acid Amplfiers for Use in EUV Photoresists

July 28, 2011

Author(s)

Kirstin Kruger, craig higgins, Gregg M. Gallatin, Robert Brainard

We postulate that the best way to simultaneously improve resolution, line edge roughness (LER), and sensitivity all in EUV resists is to increase the number of...

Magnetic Tunnel Junctions Fabricated Using Ion Neutralization Energy as a Tool

July 25, 2011

Author(s)

Joshua M. Pomeroy, Holger Grube, Pei-Ling Sun, Yun-Che Wang, Russell E. Lake

The neutralization energy of highly charged ions (HCIs) is used as an intermediate processing step to modify the electrical properties of magnetic tunnel...

Extraction of Reflectivity From Microwave BlackBody Target Using Free-Space Measuements

July 24, 2011

Author(s)

Dazhen Gu, Derek A. Houtz, James P. Randa, Dave K. Walker

We report on the characterization of blackbody target reflections as part of the recent progress on the development of brightness temperature standards for...

Large-Area Overhead Manipulator for Access of Fields

July 22, 2011

Author(s)

Jeffrey W. White, Roger V. Bostelman

Multi-axis, cable-driven manipulators have evolved over many years providing large area suspended platform access, programmability, relatively rigid and...

Used Nuclear Fuel Transportation Package Seal Performance inBeyond Design Basis Thermal Conditions

July 21, 2011

Author(s)

Jiann Yang, Edward Hnetkovsky, Felix Gonzalez, Christopher Bajwa, Robert Einziger, Earl Easton

The U.S. Nuclear Regulatory Commission (NRC) is evaluating the performance of seals in used fuel transportation packages during beyond-design-basis fires...

Gas Hydrate Research Database and Options for Data Exchange

July 21, 2011

Author(s)

Kenneth G. Kroenlein, Chris D. Muzny, Vladimir Diky, Robert D. Chirico, Michael D. Frenkel, E. D. Sloan

To facilitate advances in application of technologies pertaining to gas hydrates, a freely available data resource containing experimentally derived information...

Predicting Failure in Complex Systems by Perturbing Markov Chain Models

July 21, 2011

Author(s)

Christopher E. Dabrowski, Fern Y. Hunt

In recent years, substantial research has been devoted to monitoring and predicting performance degradations in real-world complex systems within large entities...

A public randomness service

July 21, 2011

Author(s)

Michael J. Fischer, Michaela Iorga, Rene Peralta

We argue for the deployment of sources of randomness on the Internet for promoting and enhancing electronic commerce. We describe, in rough detail, our planned...

Advanced Image Composition with Intra-Frame Drift Correction

July 19, 2011

Author(s)

Petr Cizmar, Andras Vladar, Michael T. Postek

Drift Corrected Image Composition (DCIC) is a real-time technique that allows for acquiring significantly more accurate images compare to traditional slow or...

Cloud Service Feature Driven Security Policies for Virtualized Infrastructures

July 19, 2011

Author(s)

Ramaswamy Chandramouli

With the increasing maturity of various cloud service delivery models (Software as a Service (SaaS), Platform as a Service (PaaS), Infrastructure as a Service...

Increased responsivity pyroelectric radiometer with dome input and temperature control

July 18, 2011

Author(s)

George P. Eppeldauer, Jinan Zeng, Leonard M. Hanssen

Pyroelectric radiometers with noise-equivalent-power (NEP) close to 1 nW/Hz¿ have been developed to measure less than 1 microwatt radiant power levels at room...

Comparison of Au-In Transient Liquid Phase Bonding Designs for SiC Power Semiconductor Device Packaging

July 18, 2011

Author(s)

Brian J. Grummel, Z. J. Shen, Allen R. Hefner Jr.

Transient liquid phase (TLP) bonding is an advanced die-attach technique for wide-bandgap power semiconductor and high-temperature packaging. TLP bonding...

Predicting Macroscopic Dynamics in Large Distributed Systems

July 18, 2011

Author(s)

Kevin L. Mills, James J. Filliben

In this paper, we outline an approach that can be used to predict macroscopic dynamics when new components are deployed in a large distributed system. Our...

The Effect of Folding on the Mechanical Properties and Internal Structures of Fibers Used in Ballistic Applications

July 18, 2011

Author(s)

Haruki Kobayashi, Walter G. McDonough, Hae-Jeong Lee, Jae H. Kim, Amanda L. Forster, Kirk D. Rice, Gale A. Holmes

The failure of a first responder's soft body armor (SBA) composed of poly (p-phenylene benzobisoxazole) (PBO) fibers has prompted researchers to assess the long...

A Statistical Analysis of Steel Truss Temperature Data Recorded During Fire Resistance Tests

July 15, 2011

Author(s)

Dilip K. Banerjee, Emil Simiu, John L. Gross, Raghu N. Kacker

The performance of composite floor steel trusses in fires is a function of the steel temperatures within the trusses. For any given specified fire and composite...

On the Security of Hash Functions Employing Blockcipher Postprocessing

July 14, 2011

Author(s)

Dong H. Chang, Mridul Nandi, Moti Yung

Analyzing desired generic properties of hash functions is an important current area in cryptography. For example, in Eurocrypt 2009, Dodis, Ristenpart and...

Seismic Assessment of a Steel Moment Frame Designed Per ASCE 7 with ASCE 41

July 13, 2011

Author(s)

Matthew S. Speicher, John L. Harris

Comparison of Gas Velocity Measurements and CFD Predictions in the Exhaust Duct of a Stationary Source

July 13, 2011

Author(s)

Rodney A. Bryant, Olatunde B. Sanni, Elizabeth F. Moore, Robert P. Borthwick, Marco G. Fernandez, Iosif I. Shinder, Jiann C. Yang, Aaron N. Johnson

Two series of independent flow measurements were conducted for cross validation of flow velocity in the exhaust duct of the NIST Large Fire Laboratory. In the...

Dimensional Analysis of Through Silicon Vias Using the TSOM Method

July 12, 2011

Author(s)

Ravikiran Attota, Andrew Rudack

There is a great need for accurate, truly-3D metrology solutions that can be used for analysis of high aspect ratio features such as through-silicon-vias (TSVs)...

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